Hi furkkok,

welcome to the Club VAIO Questions & Answers forum..:smileyhappy:

Is there a key on your laptop to enable enable TV-Out, possible one of your F keys, if so try pressing FN & the F key..

Also have you checked that the output resolution and refresh rate of your laptop matches the resolutions the television is  capable of displaying..

Are you able to successfully connect any other HDMI devices to your TV.?

Have you tried connecting your lpatop to another HDMI TV